海底浅层介质切变波的初步研究  

A PRELIMINARY STUDY OF SHEAR WAVE IN SEAFLOOR SURFACE SEDIMENTS

作　　者：卢博[1] 李赶先[1] 黄韶健[1] 

机构地区：[1]中国科学院南海海洋研究所与广州地球化学研究所边缘海地质重点实验室,广东广州510301

出　　处：《热带海洋学报》2004年第4期11-18,共8页Journal of Tropical Oceanography

基　　金：国家自然科学基金项目(40176012);中国科学院南海海洋研究所;广州地球化学研究所边缘海地质重点实验室部分资助

摘　　要：初步分析了中国沿海海底浅层介质切变波的传播特性,讨论了多种海底浅层介质切变波与压缩波、物理力学性质之间的关系,并与Hamilton和Chen等人的结果进行了比较。认为海底浅层介质存在切变模量,切变波可以被测量出来,切变波速为50—600m·s-1,测量频率在50—200kHz之间,用波速比可以评价海底浅层介质的应力 应变性质。研究工作有助于描述和评价中国沿海海底浅层介质声学物理性状,并为最终建立中国沿海海底地声模型提供依据。The paper preliminary analyzes the transmission characteristics of shear wave in seafloor surface sediments of China offshore sea areas, discusses the relations of the shear wave with the compression wave and the physical and mechanical features of seafloor surface sediments, and compares the testing results with those by Hamilton and Chen et al. The results show that the shear wave can be tested if the seafloor surface sediments have tangent modulus. The shear wave velocity ranges from 50 to 600m·s^(-1), and the measured frequency ranges from 50 to 200kHz. The sound velocity rate of shear wave and compression wave can be used to appraise the stress-strain feature of seafloor surface sediments. This study will help analyze and appraise the seafloor sedimentary acoustic-mechanical feature and to build the geological-acoustic model in China offshore sea areas.

关 键 词：中国海 海底浅层介质 切变波 应力-应变 

分 类 号：P733.23[天文地球—物理海洋学]